Boyfriend son hates me

My bf and I have been together for about 10 months. He has been divorced for a year and a half; wife cheated. I met his son about 3 months in. About a month ago, he started doing things to make me feel unwelcome. Such as throwing water on my boyfriend‘s bed, ignoring me when I’m there and hiding stuff. My boyfriend and his son had a long talk and everything seem to be going OK for a while. Then last night we were doing some Christmas traditions. As we were making ornaments, he took mine off the tree and to see it to break them. He did talk to his mom saying he didn’t mean to do it but miss doing it with her. He also feels like his dad spends a lot of time with me. Yeah his dad does try to do stuff with just him and his son Never wants to. We do plan to have me move in, but when everybody be comfortable. I’m trying to be there as I can, but also allow them to have their own guy time and then all this have family time. It breaks my heart that he won’t talk to his dad about his feelings but instead acts mean towards me. I’m trying to hold my ground to stay in this relationship. At the same time, it truly getting to me. I don’t know what to do to make him realize I’m not the enemy.